Exemplo n.º 1
0
        public static void crypto_sign_keypair(byte[] pk, int pkoffset, byte[] sk, int skoffset, byte[] seed, int seedoffset)
        {
            GroupElementP3 A;
            int            i;

            Array.Copy(seed, seedoffset, sk, skoffset, 32);
            byte[] h = Sha512.Hash(sk, skoffset, 32);//ToDo: Remove alloc
            ScalarOperations.sc_clamp(h, 0);

            GroupOperations.ge_scalarmult_base(out A, h, 0);
            GroupOperations.ge_p3_tobytes(pk, pkoffset, ref A);

            for (i = 0; i < 32; ++i)
            {
                sk[skoffset + 32 + i] = pk[pkoffset + i];
            }
            CryptoBytes.Wipe(h);
        }
Exemplo n.º 2
0
        /*public static void crypto_sign(
         * byte[] sm, out int smlen,
         * byte[] m, int mlen,
         * byte[] sk
         * )
         * {
         *      byte[] az = new byte[64];
         *      byte[] r = new byte[64];
         *      byte[] hram = new byte[64];
         *      GroupElementP3 R;
         *      int i;
         *
         *      Helpers.crypto_hash_sha512(az, sk, 0, 32);
         *      az[0] &= 248;
         *      az[31] &= 63;
         *      az[31] |= 64;
         *
         *      smlen = mlen + 64;
         *      for (i = 0; i < mlen; ++i) sm[64 + i] = m[i];
         *      for (i = 0; i < 32; ++i) sm[32 + i] = az[32 + i];
         *      Helpers.crypto_hash_sha512(r, sm, 32, mlen + 32);
         *      for (i = 0; i < 32; ++i) sm[32 + i] = sk[32 + i];
         *
         *      ScalarOperations.sc_reduce(r);
         *      GroupOperations.ge_scalarmult_base(out R, r, 0);
         *      GroupOperations.ge_p3_tobytes(sm, 0, ref R);
         *
         *      Helpers.crypto_hash_sha512(hram, sm, 0, mlen + 64);
         *      ScalarOperations.sc_reduce(hram);
         *      var sm32 = new byte[32];
         *      Array.Copy(sm, 32, sm32, 0, 32);
         *      ScalarOperations.sc_muladd(sm32, hram, az, r);
         *      Array.Copy(sm32, 0, sm, 32, 32);
         * }*/

        public static void crypto_sign2(
            byte[] sig, int sigoffset,
            byte[] m, int moffset, int mlen,
            byte[] sk, int skoffset)
        {
            byte[]         az;
            byte[]         r;
            byte[]         hram;
            GroupElementP3 R;
            var            hasher = new Sha512();
            {
                hasher.Update(sk, skoffset, 32);
                az = hasher.Finish();
                ScalarOperations.sc_clamp(az, 0);

                hasher.Init();
                hasher.Update(az, 32, 32);
                hasher.Update(m, moffset, mlen);
                r = hasher.Finish();

                ScalarOperations.sc_reduce(r);
                GroupOperations.ge_scalarmult_base(out R, r, 0);
                GroupOperations.ge_p3_tobytes(sig, sigoffset, ref R);

                hasher.Init();
                hasher.Update(sig, sigoffset, 32);
                hasher.Update(sk, skoffset + 32, 32);
                hasher.Update(m, moffset, mlen);
                hram = hasher.Finish();

                ScalarOperations.sc_reduce(hram);
                var s = new byte[32];                //todo: remove allocation
                Array.Copy(sig, sigoffset + 32, s, 0, 32);
                ScalarOperations.sc_muladd(s, hram, az, r);
                Array.Copy(s, 0, sig, sigoffset + 32, 32);
                CryptoBytes.Wipe(s);
            }
        }